open source

2020-11-11 16:17:13 +08:00
parent 4d989f3ecb
commit bc4ca748de
2441 changed files with 623057 additions and 2 deletions
@@ -0,0 +1,287 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2010 by Chris Robinson
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ *  Boston, MA  02111-1307, USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <jni.h>
+#include <pthread.h>
+#include "alMain.h"
+#include "AL/al.h"
+#include "AL/alc.h"
+
+static const ALCchar android_device[] = "Android Default";
+
+static JavaVM* javaVM = NULL;
+
+static jclass cAudioTrack = NULL;
+
+static jmethodID mAudioTrack;
+static jmethodID mGetMinBufferSize;
+static jmethodID mPlay;
+static jmethodID mStop;
+static jmethodID mRelease;
+static jmethodID mWrite;
+
+jint JNI_OnLoad(JavaVM* vm, void* reserved)
+{
+    javaVM = vm;
+    return JNI_VERSION_1_2;
+}
+
+static JNIEnv* GetEnv()
+{
+	/*
+    JNIEnv* env = NULL;
+    if (javaVM) (*javaVM)->GetEnv(javaVM, (void**)&env, JNI_VERSION_1_2);
+    return env;
+	*/
+	JNIEnv* env = NULL;
+
+	if (javaVM) (*javaVM)->GetEnv(javaVM, (void**)&env, JNI_VERSION_1_2);
+	
+	(*javaVM)->AttachCurrentThread(javaVM, &env, NULL);
+	return env;	
+}
+
+typedef struct
+{
+    pthread_t thread;
+    volatile int running;
+} AndroidData;
+
+#define STREAM_MUSIC 3
+#define CHANNEL_CONFIGURATION_MONO 2
+#define CHANNEL_CONFIGURATION_STEREO 3
+#define ENCODING_PCM_8BIT 3
+#define ENCODING_PCM_16BIT 2
+#define MODE_STREAM 1
+
+static void* thread_function(void* arg)
+{
+    ALCdevice* device = (ALCdevice*)arg;
+    AndroidData* data = (AndroidData*)device->ExtraData;
+
+    JNIEnv* env;
+    (*javaVM)->AttachCurrentThread(javaVM, &env, NULL);
+
+    (*env)->PushLocalFrame(env, 2);
+
+    int sampleRateInHz = device->Frequency;
+    int channelConfig = aluChannelsFromFormat(device->Format) == 1 ? CHANNEL_CONFIGURATION_MONO : CHANNEL_CONFIGURATION_STEREO;
+    int audioFormat = aluBytesFromFormat(device->Format) == 1 ? ENCODING_PCM_8BIT : ENCODING_PCM_16BIT;
+
+    int bufferSizeInBytes = (*env)->CallStaticIntMethod(env, cAudioTrack, 
+        mGetMinBufferSize, sampleRateInHz, channelConfig, audioFormat);
+
+    int bufferSizeInSamples = bufferSizeInBytes / aluFrameSizeFromFormat(device->Format);
+
+    jobject track = (*env)->NewObject(env, cAudioTrack, mAudioTrack,
+        STREAM_MUSIC, sampleRateInHz, channelConfig, audioFormat, device->NumUpdates * bufferSizeInBytes, MODE_STREAM);
+
+    (*env)->CallNonvirtualVoidMethod(env, track, cAudioTrack, mPlay);
+
+    jarray buffer = (*env)->NewByteArray(env, bufferSizeInBytes);
+
+    while (data->running)
+    {
+        void* pBuffer = (*env)->GetPrimitiveArrayCritical(env, buffer, NULL);
+
+        if (pBuffer)
+        {
+            aluMixData(device, pBuffer, bufferSizeInSamples);
+            (*env)->ReleasePrimitiveArrayCritical(env, buffer, pBuffer, 0);
+
+            (*env)->CallNonvirtualIntMethod(env, track, cAudioTrack, mWrite, buffer, 0, bufferSizeInBytes);
+        }
+        else
+        {
+            AL_PRINT("Failed to get pointer to array bytes");
+        }
+    }
+    
+    (*env)->CallNonvirtualVoidMethod(env, track, cAudioTrack, mStop);
+    (*env)->CallNonvirtualVoidMethod(env, track, cAudioTrack, mRelease);
+
+    (*env)->PopLocalFrame(env, NULL);
+
+    (*javaVM)->DetachCurrentThread(javaVM);
+    return NULL;
+}
+
+static ALCboolean android_open_playback(ALCdevice *device, const ALCchar *deviceName)
+{
+    JNIEnv* env = GetEnv();
+    AndroidData* data;
+    int channels;
+    int bytes;
+
+    if (!cAudioTrack)
+    {
+        /* Cache AudioTrack class and it's method id's
+         * And do this only once!
+         */
+
+        cAudioTrack = (*env)->FindClass(env, "android/media/AudioTrack");
+        if (!cAudioTrack)
+        {
+            AL_PRINT("android.media.AudioTrack class is not found. Are you running at least 1.5 version?");
+            return ALC_FALSE;
+        }
+
+        cAudioTrack = (*env)->NewGlobalRef(env, cAudioTrack);
+
+        mAudioTrack = (*env)->GetMethodID(env, cAudioTrack, "<init>", "(IIIIII)V");
+        mGetMinBufferSize = (*env)->GetStaticMethodID(env, cAudioTrack, "getMinBufferSize", "(III)I");
+        mPlay = (*env)->GetMethodID(env, cAudioTrack, "play", "()V");
+        mStop = (*env)->GetMethodID(env, cAudioTrack, "stop", "()V");
+        mRelease = (*env)->GetMethodID(env, cAudioTrack, "release", "()V");
+        mWrite = (*env)->GetMethodID(env, cAudioTrack, "write", "([BII)I");
+    }
+
+    if (!deviceName)
+    {
+        deviceName = android_device;
+    }
+    else if (strcmp(deviceName, android_device) != 0)
+    {
+        return ALC_FALSE;
+    }
+
+    data = (AndroidData*)calloc(1, sizeof(*data));
+    device->szDeviceName = strdup(deviceName);
+    device->ExtraData = data;
+    return ALC_TRUE;
+}
+
+static void android_close_playback(ALCdevice *device)
+{
+    AndroidData* data = (AndroidData*)device->ExtraData;
+    if (data != NULL)
+    {
+        free(data);
+        device->ExtraData = NULL;
+    }
+}
+
+static ALCboolean android_reset_playback(ALCdevice *device)
+{
+    AndroidData* data = (AndroidData*)device->ExtraData;
+
+    if (aluChannelsFromFormat(device->Format) >= 2)
+    {
+        device->Format = aluBytesFromFormat(device->Format) >= 2 ? AL_FORMAT_STEREO16 : AL_FORMAT_STEREO8;
+    }
+    else
+    {
+        device->Format = aluBytesFromFormat(device->Format) >= 2 ? AL_FORMAT_MONO16 : AL_FORMAT_MONO8;
+    }
+
+    SetDefaultChannelOrder(device);
+
+    data->running = 1;
+    pthread_create(&data->thread, NULL, thread_function, device);
+
+    return ALC_TRUE;
+}
+
+static void android_stop_playback(ALCdevice *device)
+{
+    AndroidData* data = (AndroidData*)device->ExtraData;
+
+    if (data->running)
+    {
+        data->running = 0;
+        pthread_join(data->thread, NULL);
+    }
+}
+
+static ALCboolean android_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
+{
+    (void)pDevice;
+    (void)deviceName;
+    return ALC_FALSE;
+}
+
+static void android_close_capture(ALCdevice *pDevice)
+{
+    (void)pDevice;
+}
+
+static void android_start_capture(ALCdevice *pDevice)
+{
+    (void)pDevice;
+}
+
+static void android_stop_capture(ALCdevice *pDevice)
+{
+    (void)pDevice;
+}
+
+static void android_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
+{
+    (void)pDevice;
+    (void)pBuffer;
+    (void)lSamples;
+}
+
+static ALCuint android_available_samples(ALCdevice *pDevice)
+{
+    (void)pDevice;
+    return 0;
+}
+
+static const BackendFuncs android_funcs = {
+    android_open_playback,
+    android_close_playback,
+    android_reset_playback,
+    android_stop_playback,
+    android_open_capture,
+    android_close_capture,
+    android_start_capture,
+    android_stop_capture,
+    android_capture_samples,
+    android_available_samples
+};
+
+void alc_android_init(BackendFuncs *func_list)
+{
+    *func_list = android_funcs;
+}
+
+void alc_android_deinit(void)
+{
+    JNIEnv* env = GetEnv();
+
+    /* release cached AudioTrack class */
+    (*env)->DeleteGlobalRef(env, cAudioTrack);
+}
+
+void alc_android_probe(int type)
+{
+    if (type == DEVICE_PROBE)
+    {
+        AppendDeviceList(android_device);
+    }
+    else if (type == ALL_DEVICE_PROBE)
+    {
+        AppendAllDeviceList(android_device);
+    }
+}